From: lharr...@gmail.com   
      
   On Wednesday, July 5, 2023 at 10:17:46 PM UTC-4, William Murray wrote:   
   > I just did some preliminary testing, and I also got 41 via speedsys for the   
   8580 TurboProcessor with Pentium Overdrive. My Eduquest 55 with the same   
   Pentium Overdrive scores 61.    
   >    
   > Other benchmarks show unexpectedly low performance as well, which is weird   
   since most artificial CPU benchmarks are not sensitive to other stuff on the   
   motherboard. For example, in Norton Sysinfo 8, my 8580 TurboProcessor only   
   scores 100. HOWEVER, my    
   IBM XT with Cyrix 5x86-120 scores ~250! It's a very strange hacked together   
   system that uses an Intel Inboard 386 and a Transcomputer 386-486 adapter, so   
   it has mediocre RAM speeds with a cripplingly slow 4.77MHz bus, so obviously   
   the test only cares    
   about the CPU; I have no idea why the TurboProcessor should score so low. The   
   POD-equipped Eduquest with Sysinfo scores ~260. I can't run speedsys though on   
   my XT, so IDK what it would be like.    
   >    
   > I am using the 1.31 BIOS. As far as I can tell, 1.31 works with the Pentium   
   just fine. It identifies the processor as P24T, but erroneously marks it as   
   66MHz (chkcpu identifies it as operating at the intended 83MHz though).    
   >    
   > Also, the Eduquest does WB L1 cache instead of WT like the 8580, so that   
   could at least partially explain things. Also, I don't know if L2 Cache is   
   used for speedsys, but I have 256KB in the Eduquest and 0KB in the 8580.    
   >    
   > I wonder if it could have to do with some Pentium-specific registers not   
   being set? It almost feels like the cache is not being used, or some   
   enhancement has not been properly activated. I also might want to try out a   
   Cyrix 5x86-133 and see how it goes,   
    since messing with the performance-enhancing registers on those CPUs is easy,   
   though I need to get a heatsink for that first.   
      
   It's odd isn't it?  Your results are identical and I found the L2 cache didn't   
   do much, but I found it didn't do much for CPU tests on the Valuepoint   
   either.    I figure that the boost from the cache will be application or game   
   specific.  I will say this,   
    the Kingston TurboChip and the 100Mhz 486 Overdrive also score much less than   
   in other systems so I didn't feel that it was Pentium Specific.     There is a   
   jumper on the bottom left of the board, J14, that is undocumented and I've   
   even tried flipping    
   that jumper with no help either.   I've never been able to tell what it does.   
      
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